Solution to task 311 from Chertov´s for extramural stud

Solution to task 311 from Chertov´s for extramural stud

311. A thin rod l = 20 cm long carries a uniformly distributed charge τ = 0.1 µC. Determine the strength E of the electric field created by the distributed charge at point A, lying on the axis of the rod at a distance a = 20 cm from its end.